Subject

    Quantitative Aptitude

    Topic

    Average

    If A = 1/5 and B = 1/8 and the average of A, B and C is 9/40. What is the value of C given that A, B and C are three rational numbers?

    ক)
    13/40
    খ)
    7/20
    গ)
    1/12
    ঘ)
    1/20
    ঙ)
    None of these

    Explanation

    According to the given information, A = 1/5 B = 1/8 Average = 9/40 We know that, Mean = (Sum of all observations)/(Number of observations) 940  =  15+18+C3\frac{9}{{40}}{\rm{\;}} = {\rm{\;}}\frac{{\frac{1}{5} + \frac{1}{8} + {\rm{C}}}}{3} 2740  =  8+540+C\frac{{27}}{{40}}{\rm{\;}} = {\rm{\;}}\frac{{8 + 5}}{{40}} + {\rm{C}} 27/40 - 13/40 = C C = 7/20

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